/Engine/Source/Runtime/Core/Public/Misc/DataDrivenPlatformInfoRegistry.h
Retrieve the full list of all known preview platforms from all DDPIs
static const [TArray](API\Runtime\Core\Containers\TArray)< struct [FPreviewPlatformMenuItem](API\Runtime\Core\Misc\FPreviewPlatformMenuItem) > & GetAllPreviewPlatformMenuItems()